<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="/js/vue.js"></script>
</head>
<body>
    <div id="app">
        <p>First name:<input type="text"v-model="firstName"></p>
        <p>Last name:<input type="text"v-model="firstName"></p>
        <p>fullname:{{fullname}}</p>
        <button @click="change">改变fullname</button>
    </div>
    
</body>
<script>
    var vm = new Vue({
        el:'#app',
        data:{
            firstName:'',
            lastName:''
        },
        methods:{
            change(){
                this.fullname='Harry Potter';
            }
        },
        computed:{
            fullname:{
                //getter用于读取
                get:function(){
                    return this.firstName + '' + this.lastName;
                },
                //setter写入时触发
                set:function(newVal){
                    var arr= newVal.sp;it('');
                    this.firstName=arr[0];
                    this.lastName=arr[1];
                }
            }
        }
    })
</script>
</html>